alcaeus/inferences/memberAssertion.js

Hydra Core hypermedia-aware client library

import { hydra } from '@tpluscode/rdf-ns-builders';
export function* addExplicitStatementsInferredFromMemberAssertion(dataset, env) {
    for (const collection of env.clownface({ dataset }).has([hydra.manages, hydra.memberAssertion]).toArray()) {
        const assertions = collection.out([hydra.manages, hydra.memberAssertion]).toArray();
        for (const member of collection.out(hydra.member).toArray()) {
            for (const assertion of assertions) {
                let blanks = 0;
                let subject = assertion.out(hydra.subject);
                let predicate = assertion.out(hydra.property);
                let object = assertion.out(hydra.object);
                if (subject.terms.length === 0) {
                    subject = member;
                    blanks++;
                }
                if (predicate.terms.length === 0) {
                    predicate = member;
                    blanks++;
                }
                if (object.terms.length === 0) {
                    object = member;
                    blanks++;
                }
                if (blanks === 1) {
                    for (const s of subject.terms) {
                        for (const p of predicate.terms) {
                            for (const o of object.terms) {
                                yield env.quad(s, p, o);
                            }
                        }
                    }
                }
            }
        }
    }
}